[ci] Skip prod deploy for documentation-factory bookkeeping paths

Add spec/**, .agents/**, AGENTS.md, CLAUDE.md to deploy_to_geddes_prod paths-ignore -- they never affect the built site.

Author: glentner

.github/workflows/deploy_to_geddes_prod.yml

@@ -8,6 +8,11 @@ on:
       - 'modulefiles/**'
       - 'tools/**'
       - 'wcag_audit/**'
+      # Documentation-factory bookkeeping never affects the built site (all outside docs/).
+      - 'spec/**'
+      - '.agents/**'
+      - 'AGENTS.md'
+      - 'CLAUDE.md'
   workflow_dispatch:
 
 permissions: